diff --git a/app/ui/MainWindow.ui b/app/ui/MainWindow.ui
index 7aab4f3..c3d6abe 100644
--- a/app/ui/MainWindow.ui
+++ b/app/ui/MainWindow.ui
@@ -85,7 +85,7 @@
            <number>0</number>
           </property>
           <item>
-           <widget class="QWidget" name="dateSourceWidget" native="true"/>
+           <widget class="DataSourceWidget" name="dataSourceWidget" native="true"/>
           </item>
           <item>
            <widget class="QWidget" name="dateTimeWidget" native="true"/>
@@ -202,6 +202,12 @@
    <header location="global">sidepane/SqpSidePane.h</header>
    <container>1</container>
   </customwidget>
+  <customwidget>
+   <class>DataSourceWidget</class>
+   <extends>QWidget</extends>
+   <header location="global">DataSource/DataSourceWidget.h</header>
+   <container>1</container>
+  </customwidget>
  </customwidgets>
  <resources/>
  <connections/>
diff --git a/gui/include/DataSource/DataSourceWidget.h b/gui/include/DataSource/DataSourceWidget.h
new file mode 100644
index 0000000..ea3f2fa
--- /dev/null
+++ b/gui/include/DataSource/DataSourceWidget.h
@@ -0,0 +1,25 @@
+#ifndef SCIQLOP_DATASOURCEWIDGET_H
+#define SCIQLOP_DATASOURCEWIDGET_H
+
+#include <Common/spimpl.h>
+
+#include <QWidget>
+
+class DataSourceItem;
+
+/**
+ * @brief The DataSourceWidget handles the graphical representation (as a tree) of the data sources
+ * attached to SciQlop.
+ */
+class DataSourceWidget : public QWidget {
+    Q_OBJECT
+
+public:
+    explicit DataSourceWidget(QWidget *parent = 0);
+
+private:
+    class DataSourceWidgetPrivate;
+    spimpl::unique_impl_ptr<DataSourceWidgetPrivate> impl;
+};
+
+#endif // SCIQLOP_DATASOURCEWIDGET_H
diff --git a/gui/src/DataSource/DataSourceWidget.cpp b/gui/src/DataSource/DataSourceWidget.cpp
new file mode 100644
index 0000000..5bba037
--- /dev/null
+++ b/gui/src/DataSource/DataSourceWidget.cpp
@@ -0,0 +1,36 @@
+#include <DataSource/DataSourceWidget.h>
+
+#include <ui_DataSourceWidget.h>
+
+#include <DataSource/DataSourceItem.h>
+#include <DataSource/DataSourceTreeWidgetItem.h>
+
+namespace {
+
+/// Number of columns displayed in the tree
+const auto TREE_NB_COLUMNS = 1;
+
+/// Header labels for the tree
+const auto TREE_HEADER_LABELS = QStringList{QObject::tr("Name")};
+
+} // namespace
+
+class DataSourceWidget::DataSourceWidgetPrivate {
+public:
+    explicit DataSourceWidgetPrivate(DataSourceWidget &widget)
+            : m_Ui{std::make_unique<Ui::DataSourceWidget>()}
+    {
+        m_Ui->setupUi(&widget);
+
+        // Set tree properties
+        m_Ui->treeWidget->setColumnCount(TREE_NB_COLUMNS);
+        m_Ui->treeWidget->setHeaderLabels(TREE_HEADER_LABELS);
+    }
+
+    std::unique_ptr<Ui::DataSourceWidget> m_Ui;
+};
+
+DataSourceWidget::DataSourceWidget(QWidget *parent)
+        : QWidget{parent}, impl{spimpl::make_unique_impl<DataSourceWidgetPrivate>(*this)}
+{
+}
diff --git a/gui/ui/DataSource/DataSourceWidget.ui b/gui/ui/DataSource/DataSourceWidget.ui
new file mode 100644
index 0000000..a7cf875
--- /dev/null
+++ b/gui/ui/DataSource/DataSourceWidget.ui
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>DataSourceWidget</class>
+ <widget class="QWidget" name="DataSourceWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Data sources</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
+    <widget class="QTreeWidget" name="treeWidget"/>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>